Fig. 2

Distribution of SNPs across Chromosomes after quality control (a), population structure for two Duroc populations (b), Quantile–quantile (Q–Q) plots of genome-wide association studies for ACC in the two populations (c), and LD decay across the whole genome of the association population (d). For a, the Y-axis values are autosomes and X-axis are chromosome position in Mb. For b, the PCA1 present first principal component, PCA2 is second principal component. The first two PCs derived from the genomic kinship matrix were extracted to assess the population structure. The plot c shows the observed versus expected negative log10 P-value. In plot 4, the red and black colors represent LD decay in the American and Canadian Duroc populations, respectively